Cleaning strategies of six basic lenses in compulsory courses for novices
- Dec 11, 2019
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It's a matter of a hundred claws for many people to put the lens in grey, and the so-called "three nothing" of lens is often an important weight to raise the price of second-hand lens. In fact, 99% of the dust will not affect the image quality, but we still can't ignore the unfortunate 1%.
·Nikon 24-70 f / 2.8 AF-S (for most Nikon "d" series lenses) · Canon 17-55 f / 2.8 is (for Canon 24-105, 24-70 f / 4 is, 24-70 f / 2.8 II) · Canon 85mm f / 1.2 L · Canon 85mm f / 1.8 (for Canon 100m f / 2) · Canon 70-200 F / 2.8 non is (for Canon 70-200 f / 2.8 is I and II) · Canon 100-400 is l (for Canon 28-300 is L)
Dust removal of Nikon 24-70mm f / 2.8d rear mirror group
&Remove the three fixing screws at the end of the mirror and take out the whole rear lens.
Remove the three fixing screws at the end of the mirror
Take out the whole rear lens
&Nbsp; & nbsp; & nbsp; & nbsp; start air cleaning.
&Nbsp; & nbsp; & nbsp; align the gap of the rear seal ring with the diaphragm paddle, screw in the screw and reassemble.
Align the rear seal ring notch with the diaphragm paddle
&24-70mm f / 2.8d is probably one of the few simple lenses that Nikon disassembles. The rear lens and the whole lens can be completely separated, so as long as the three fixing screws at the end of the lens are removed, the whole rear lens group can be taken out. Use air to blow away the dust attached to the lens, and finally assemble it.
Dust removal of Canon ef-s 17-55mm f / 2.8 front mirror group
First of all, use tweezers and other tools to uncover the decorative ring in front of the lens, revealing the screws hidden below. Tweezers open the decorative ring in front of the lens
&Remove the three screws on the front of the lens and record their positions.
Take out the three fixing screws on the front of the lens
Record the screw position
&Nbsp; & nbsp; & nbsp; use the prepared vacuum suction cup to hold the lens center and pull up the whole front lens group.
Vacuum suction cup holds the lens center
&It's done by blowing the dust off the lens.
Air blowing to remove the dust attached to the lens
&It is very simple to disassemble and clean the dust of the front mirror group of Canon ef-s 17-55mm f / 2.8, and the method is also applicable to 24-105mm f / 4 is, 24-70mm f / 4 is and 24-70mm f / 2.8 II lens.
Dust removal of Canon EF 85mm f / 1.2 rear mirror group
Remove the four screws at the back of the lens. Remove the four screws at the end of the lens
&Nbsp; & nbsp; & nbsp; gently pry the bayonet connecting ring from the other side of the electronic contact, otherwise it may damage the cable hidden under the contact, and then blow away the dust inside with air.
Air blows away the dust inside
&It is also simple to clean the dust of Canon 85mm f / 1.2 rear mirror group, but some small details need to be paid attention to.
Dust removal of Canon EF 85mm f / 1.8 front and rear mirror groups
Rear lens group
Remove the screws at the end of the lens bayonet to fix the sealing ring. Remove the screw fixing the lens bayonet
&Remove the four screws at the end of the lens.
Remove the four screws at the end of the lens
&Nbsp; & nbsp; & nbsp; use your fingers to pry it from one side of the lens bayonet, hold the metal bayonet with one finger, and lift the sealing ring with the other hand.
Finger cocked bayonet
Lift up the sealing ring
&When removing the metal bayonet of the lens, pay attention to one side of the electronic contact and do not crush it.
Take out the metal bayonet of lens
&The PCB circuit of the whole lens is exposed. Be careful of the wiring when disassembling. There are two symmetrical notches around the lens, which is the "mechanism" for unscrewing the lens group.
PCB circuit of lens
&With the help of a two foot open spanner or a herringbone spanner, turn the whole set of lenses anticlockwise (or clockwise) for several turns according to the aperture of the lens notch, and do not let the convex points on the spanner scratch the wires during the disassembly.
Turn the whole set of lenses anticlockwise according to the aperture of lens notch
&After the back lens group is loose, screw out the whole lens group with lens paper and other items.
Screw out the whole lens set
&After the lens set is removed, it can be cleaned by air blowing. When assembling, no matter the lens or the screw, it must be tightened.
Air blowing for cleaning and assembly
&It is a little difficult to clean the dust in Canon EF 85mm f / 1.8. It not only needs the help of professional tools such as two foot open spanner, but also puts forward higher requirements for the technology of mirror remover.
Front lens group:
There are three screws in front of the focusing ring, which are used to fix the front shell of the lens. Three screws in front of the focusing ring
Remove the screws and take out the whole housing. Remove the screws and take out the housing
The inner wall of the lens shell is often a disaster area contaminated with dust. Inner wall of lens shell
There are three fixing screws around the front mirror group. Three fixing screws around the front mirror set
There is a fine-tuning screw on one side of the lens barrel. Do not move it. Fine adjustment screw on one side of the barrel
Remove the front mirror group
Take out the front mirror group and start cleaning.
Dust removal of Canon EF 70-200mm f / 2.8 is front mirror group
It is almost impossible to completely remove the dust in this lens, but the front mirror group is relatively easy to solve. Canon EF 70-200mm f / 2.8 is front mirror set
&To remove the front mirror group, you must first remove the filter ring at the front of the lens. Fold back the focusing ring rubber to expose the fixing screw hidden under it.
Reversed focusing ring rubber
&When pulling out the filter ring, you can see that the inside of the tube is covered with a plastic film.
Pull up the filter ring and you can see a layer of plastic film
&Nbsp; & nbsp; & nbsp; & nbsp; find the beginning of the plastic film and tear it off.
Pull off plastic film
Air blowing to remove the dust in the mirror tube
&Nbsp; & nbsp; & nbsp; & nbsp; use air blowing to remove the dust attached to the barrel.
Dust removal of Canon EF 100-400mm f / 4.5-5.5 front mirror group
It should be noted that the disassembly of this lens is very difficult, the internal screws are screwed tightly, and many parts are glued. Without professional tools and skilled experience, the lens may be scrapped. Canon EF 100-400mm f / 4.5-5.5 front mirror group
First remove the silver ring at the front of the lens. Remove the silver ring at the front of the lens
&Nbsp; & nbsp; & nbsp; & nbsp; there is a screw hidden under the ring, which is extremely difficult to screw. It is suggested to drop a drop of alcohol before operation or heat it with electric iron to soften the glue. When you do it, six parts of the force go down and four parts turn.
The screw under the ring
After all the screws are removed, the entire front-end housing can be taken out. Remove all screws
Take out the whole front end shell
There is a brass screw at the joint of the focusing cylinder, which is used to limit the movement of the focusing cylinder. Remove it and take out the focusing ring shell. Brass screw at the joint of focusing cylinder
Take out the focusing ring shell
Air blowing for cleaning
Air blowing to clean all parts of the lens barrel
Clean all parts of the tube with air.